【摘要】 小麦品种对赤霉病的抗扩展性,是由核遗传和多基因控制的数量性状,遗传力高低因组合不同而异。杂种一代的发病小穗数与抗病亲本,感病亲本及中亲值呈显著的正相关,回归值达0.01显著水准。杂种一代的抗性偏向抗病亲本,有明显杂种优势。用抗病亲本与F₁回交,其抗病性有明显提高。 F₂单株发病小穗数变异范围较大,随着世代的增高,发病小穗数变异幅度缩小,而且在选择的作用下有所减少。作者还就该性状的选择方法作了初步的研究,认为在F₃以后各世代采用系统选择比混合法要好。更多还原

【Abstract】 Inoculation was made by dripping the spore suspension into single floret of wheat. Statistical analysis was based on the number of diseased spikelets.Result indicates the resistance of wheat varieties to the colonization of Gibberella zeae is controlled by multiple genes and is quantitatively inherited . The heritability of the resistance depends on different combination of parents used in crossing.The degree of resistance of Fj is closely related to that of the resistant parent. The values of regression and correlation coefficient fit significantly . This is an evidence of heterosis of resistsance in F,. The effect of backcrossing FI with the resistant parent is obvious.更多还原